An estimator on a design-build office project priced rooftop units using the manufacturer’s catalog price. They also assumed the units would arrive in 8 weeks. When procurement placed the order, the quote was 18% higher, and the delivery time was 7 months. This gap between assumed and actual costs is exactly what good mechanical estimating should prevent.
SMA Estimating LLC’s mechanical estimating services use current market prices instead of old catalog prices. On fast-track projects, equipment prices and delivery times can change quickly.
Here is why mechanical estimates can go wrong when equipment is not locked in and what affects the final cost.
Why Do Mechanical Estimates Break Down Before Equipment Is Selected?
These assumptions may not match what procurement finds months later. This is especially common with chillers, custom air handlers, and rooftop units.
According to industry reporting, Trane Technologies ended 2025 with a $7.8 billion backlog. Its applied commercial and data center chiller business had an average order-to-ship time of about 9 months (MSI Data, 2026). Large custom air handlers and central plant equipment can also take 16 to 28 weeks to arrive. A mechanical project estimating number based on last year’s lead times may already be out of date.
What Should A Mechanical Estimate Actually Separate Out?
Equipment, labor, and material costs should be priced separately, not combined into one cost per square foot. Division 23 (HVAC) work depends on getting each of these costs right.
- Equipment pricing: Current manufacturer quotes, not catalog list prices.
- Labor hours: Sequencing risk tied to actual delivery windows.
- Material takeoff: Ductwork, piping, and insulation quantities specific to the design.
Skipping any one of these and using a “per ton” or “per square foot” rate can turn a design-build estimate into a change order months later.
How Does Equipment Lead Time Actually Affect The Estimate Itself?
It affects more than the delivery date. It can also change the price because manufacturers may charge more for rushed orders. If the lead time is missed, the new quote may be higher than the original price.
| Estimating Approach | Risk Exposure |
| Catalog list price, no lead-time check | High: price and schedule both exposed |
| Confirmed quote, standard lead time | Moderate: price locked, schedule still tight |
| Confirmed quote + early procurement release | Low: price and schedule both protected |
Mechanical material estimating that ignores lead times may not reflect the real project cost. Equipment prices and delivery times can change before the equipment is ordered.
Why Does This Matter For The Overall Project Budget?
Because mechanical equipment is often one of the highest costs in a project’s mechanical, electrical, and plumbing work. A mistake here can affect the entire construction cost estimation, not just Division 23.
When a chiller or RTU costs more than expected, the extra cost does not stay in the mechanical budget. It can use up money set aside for other trades or force late changes to the design. By then, fewer options are available, and the changes can cost more.
What Should A Mechanical Estimating Partner Actually Deliver?
Use current quotes and confirmed lead times, not prices from the last project. A number that is not checked against current manufacturer data is only a guess.
SMA Estimating LLC prices mechanical equipment using current market data. They check actual quotes and lead times where possible. This helps keep the design-build schedule from relying on prices that were already outdated when the order was placed.
Before the next mechanical bid is finalized, ask one question: Is the equipment price based on a current quote, or is it still using last year’s catalog price?
Conclusion
Mechanical estimating can go wrong when equipment prices, lead times, labor, and material costs are based on old information. A price that looks right today may not be right when the equipment is actually ordered. These small gaps can lead to higher costs, delays, and change orders. SMA Estimating LLC builds mechanical estimates using the actual project scope, current equipment prices, material costs, and available lead-time information. This helps contractors avoid relying on outdated numbers and gives them a better picture of the real project cost.
